Webster's English Dictionary

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ascertain

Cross references:
  1. discover              
 
as.cer.tain \.as-*r-'ta-n\ \-'ta--n*-b*l\ \-'ta-n-m*nt\ vt [ME acertainen, 
   fr. MF acertainer, fr. a- (fr. L ad-) +] certain archaic  1: to make 
   certain, exact, or precise  2: to find out or learn with certainty  - 
   as.cer.tain.able aj